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<FONT color="green">001</FONT>    package org.hackystat.telemetry.service.server;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.util.HashMap;<a name="line.3"></a>
<FONT color="green">004</FONT>    <a name="line.4"></a>
<FONT color="green">005</FONT>    import java.util.Map;<a name="line.5"></a>
<FONT color="green">006</FONT>    <a name="line.6"></a>
<FONT color="green">007</FONT>    import org.hackystat.dailyprojectdata.client.DailyProjectDataClient;<a name="line.7"></a>
<FONT color="green">008</FONT>    import org.hackystat.sensorbase.client.SensorBaseClient;<a name="line.8"></a>
<FONT color="green">009</FONT>    import org.restlet.Context;<a name="line.9"></a>
<FONT color="green">010</FONT>    import org.restlet.Guard;<a name="line.10"></a>
<FONT color="green">011</FONT>    import org.restlet.data.ChallengeScheme;<a name="line.11"></a>
<FONT color="green">012</FONT>    <a name="line.12"></a>
<FONT color="green">013</FONT>    /**<a name="line.13"></a>
<FONT color="green">014</FONT>     * Performs authentication of each HTTP request using HTTP Basic authentication. Checks<a name="line.14"></a>
<FONT color="green">015</FONT>     * user/password credentials by pinging SensorBase, then caching authentic user/password<a name="line.15"></a>
<FONT color="green">016</FONT>     * combinations. If a cached user/password combo does not match the current user/password combo,<a name="line.16"></a>
<FONT color="green">017</FONT>     * then the SensorBase is pinged again (because maybe the user has changed their password recently).<a name="line.17"></a>
<FONT color="green">018</FONT>     * &lt;p&gt;<a name="line.18"></a>
<FONT color="green">019</FONT>     * Because this resource will always want to communicate with the underlying DailyProjectData<a name="line.19"></a>
<FONT color="green">020</FONT>     * service, this Authenticator also creates a map of user-to-DailyProjectDataClient instances which<a name="line.20"></a>
<FONT color="green">021</FONT>     * can be retrieved from the server context. This keeps the user password info in this class, while<a name="line.21"></a>
<FONT color="green">022</FONT>     * making the DailyProjectDataClient instance available to the service.<a name="line.22"></a>
<FONT color="green">023</FONT>     * <a name="line.23"></a>
<FONT color="green">024</FONT>     * @author Philip Johnson<a name="line.24"></a>
<FONT color="green">025</FONT>     */<a name="line.25"></a>
<FONT color="green">026</FONT>    public class Authenticator extends Guard {<a name="line.26"></a>
<FONT color="green">027</FONT>    <a name="line.27"></a>
<FONT color="green">028</FONT>      /** A singleton map containing previously verified credentials. */<a name="line.28"></a>
<FONT color="green">029</FONT>      private static Map&lt;String, String&gt; credentials = new HashMap&lt;String, String&gt;();<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>      /** A singleton map containing DailyProjectDataClient instances, one per credentialled user. */<a name="line.31"></a>
<FONT color="green">032</FONT>      private static Map&lt;String, DailyProjectDataClient&gt; dpdClientMap = <a name="line.32"></a>
<FONT color="green">033</FONT>        new HashMap&lt;String, DailyProjectDataClient&gt;();<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>      /** A singleton map containing SensorBaseClient instances, one per credentialled user. */<a name="line.35"></a>
<FONT color="green">036</FONT>      private static Map&lt;String, SensorBaseClient&gt; sensorBaseClientMap = <a name="line.36"></a>
<FONT color="green">037</FONT>        new HashMap&lt;String, SensorBaseClient&gt;();<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>      /** The sensorbase host, such as "http://localhost:9876/sensorbase/". */<a name="line.39"></a>
<FONT color="green">040</FONT>      private String sensorBaseHost;<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>      /** The DailyProjectData host, such as "http://localhost:9877/dailyprojectdata/". */<a name="line.42"></a>
<FONT color="green">043</FONT>      private String dpdHost;<a name="line.43"></a>
<FONT color="green">044</FONT>    <a name="line.44"></a>
<FONT color="green">045</FONT>      /** The key to be used to retrieve the DailyProjectDataClient map from the server context. */<a name="line.45"></a>
<FONT color="green">046</FONT>      public static final String AUTHENTICATOR_DPD_CLIENTS_KEY = "authenticator.dpd.clients";<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>      /** The key to be used to retrieve the SensorbaseClient map from the server context. */<a name="line.48"></a>
<FONT color="green">049</FONT>      public static final String AUTHENTICATOR_SENSORBASE_CLIENTS_KEY = <a name="line.49"></a>
<FONT color="green">050</FONT>        "authenticator.sensorbase.clients";<a name="line.50"></a>
<FONT color="green">051</FONT>    <a name="line.51"></a>
<FONT color="green">052</FONT>      /**<a name="line.52"></a>
<FONT color="green">053</FONT>       * Initializes this Guard to do HTTP Basic authentication. Puts the credentials map in the server<a name="line.53"></a>
<FONT color="green">054</FONT>       * context so that Resources can get the password associated with the uriUser for their own<a name="line.54"></a>
<FONT color="green">055</FONT>       * invocations to the SensorBase.<a name="line.55"></a>
<FONT color="green">056</FONT>       * <a name="line.56"></a>
<FONT color="green">057</FONT>       * @param context The server context.<a name="line.57"></a>
<FONT color="green">058</FONT>       * @param sensorBaseHost The sensorbase service, such as 'http://localhost:9876/sensorbase/'.<a name="line.58"></a>
<FONT color="green">059</FONT>       * @param dpdHost The DPD service, such as 'http://localhost:9877/dailyprojectdata/'.<a name="line.59"></a>
<FONT color="green">060</FONT>       */<a name="line.60"></a>
<FONT color="green">061</FONT>      public Authenticator(Context context, String sensorBaseHost, String dpdHost) {<a name="line.61"></a>
<FONT color="green">062</FONT>        super(context, ChallengeScheme.HTTP_BASIC, "DailyProjectData");<a name="line.62"></a>
<FONT color="green">063</FONT>        this.sensorBaseHost = sensorBaseHost;<a name="line.63"></a>
<FONT color="green">064</FONT>        this.dpdHost = dpdHost;<a name="line.64"></a>
<FONT color="green">065</FONT>        context.getAttributes().put(AUTHENTICATOR_DPD_CLIENTS_KEY, dpdClientMap);<a name="line.65"></a>
<FONT color="green">066</FONT>        context.getAttributes().put(AUTHENTICATOR_SENSORBASE_CLIENTS_KEY, sensorBaseClientMap);<a name="line.66"></a>
<FONT color="green">067</FONT>      }<a name="line.67"></a>
<FONT color="green">068</FONT>    <a name="line.68"></a>
<FONT color="green">069</FONT>      /**<a name="line.69"></a>
<FONT color="green">070</FONT>       * Returns true if the passed credentials are OK.<a name="line.70"></a>
<FONT color="green">071</FONT>       * <a name="line.71"></a>
<FONT color="green">072</FONT>       * @param identifier The account name.<a name="line.72"></a>
<FONT color="green">073</FONT>       * @param secretCharArray The password.<a name="line.73"></a>
<FONT color="green">074</FONT>       * @return If the credentials are valid.<a name="line.74"></a>
<FONT color="green">075</FONT>       */<a name="line.75"></a>
<FONT color="green">076</FONT>      @Override<a name="line.76"></a>
<FONT color="green">077</FONT>      protected boolean checkSecret(String identifier, char[] secretCharArray) {<a name="line.77"></a>
<FONT color="green">078</FONT>        /*<a name="line.78"></a>
<FONT color="green">079</FONT>         * I am synchronizing here on a static (class-wide) variable for two reasons: (1) JCS<a name="line.79"></a>
<FONT color="green">080</FONT>         * write-through caching fails when multiple threads access the same back-end file:<a name="line.80"></a>
<FONT color="green">081</FONT>         * &lt;https://issues.apache.org/jira/browse/JCS-31&gt;. Thus, it is vitally important to ensure that<a name="line.81"></a>
<FONT color="green">082</FONT>         * only one instance of a DPDClient for any given user is created. (2) I do not know if<a name="line.82"></a>
<FONT color="green">083</FONT>         * Restlet allows multiple Authenticator instances. Thus, I am synchronizing on a class-wide<a name="line.83"></a>
<FONT color="green">084</FONT>         * variable just in case. This synchronization creates a bottleneck on every request, but the<a name="line.84"></a>
<FONT color="green">085</FONT>         * benefits of reliable caching should outweigh this potential performance hit under high loads.<a name="line.85"></a>
<FONT color="green">086</FONT>         */<a name="line.86"></a>
<FONT color="green">087</FONT>        synchronized (dpdClientMap) {<a name="line.87"></a>
<FONT color="green">088</FONT>          String secret = new String(secretCharArray);<a name="line.88"></a>
<FONT color="green">089</FONT>          // Return true if the user/password credentials are in the cache.<a name="line.89"></a>
<FONT color="green">090</FONT>          if (credentials.containsKey(identifier) &amp;&amp; secret.equals(credentials.get(identifier))) {<a name="line.90"></a>
<FONT color="green">091</FONT>            return true;<a name="line.91"></a>
<FONT color="green">092</FONT>          }<a name="line.92"></a>
<FONT color="green">093</FONT>          // Otherwise we check the credentials with the SensorBase.<a name="line.93"></a>
<FONT color="green">094</FONT>          boolean isRegistered = SensorBaseClient.isRegistered(sensorBaseHost, identifier, secret);<a name="line.94"></a>
<FONT color="green">095</FONT>          if (isRegistered) {<a name="line.95"></a>
<FONT color="green">096</FONT>            // Credentials are good, so save them and create clients for this user.<a name="line.96"></a>
<FONT color="green">097</FONT>            credentials.put(identifier, secret);<a name="line.97"></a>
<FONT color="green">098</FONT>            // Only create a new client if there is no old one. <a name="line.98"></a>
<FONT color="green">099</FONT>            if (!dpdClientMap.containsKey(identifier)) {<a name="line.99"></a>
<FONT color="green">100</FONT>              Server server = (Server) getContext().getAttributes().get("TelemetryServer");<a name="line.100"></a>
<FONT color="green">101</FONT>              ServerProperties props = server.getServerProperties();<a name="line.101"></a>
<FONT color="green">102</FONT>              DailyProjectDataClient client = new DailyProjectDataClient(dpdHost, identifier, secret);<a name="line.102"></a>
<FONT color="green">103</FONT>              if (props.isCacheEnabled()) { // NOPMD<a name="line.103"></a>
<FONT color="green">104</FONT>                client.enableCaching(identifier, "telemetry", props.getCacheMaxLife(), props<a name="line.104"></a>
<FONT color="green">105</FONT>                    .getCacheCapacity());<a name="line.105"></a>
<FONT color="green">106</FONT>              }<a name="line.106"></a>
<FONT color="green">107</FONT>              dpdClientMap.put(identifier, client);<a name="line.107"></a>
<FONT color="green">108</FONT>            }<a name="line.108"></a>
<FONT color="green">109</FONT>            if (!sensorBaseClientMap.containsKey(identifier)) {<a name="line.109"></a>
<FONT color="green">110</FONT>              SensorBaseClient client = new SensorBaseClient(sensorBaseHost, identifier, secret);<a name="line.110"></a>
<FONT color="green">111</FONT>              sensorBaseClientMap.put(identifier, client);<a name="line.111"></a>
<FONT color="green">112</FONT>            }<a name="line.112"></a>
<FONT color="green">113</FONT>          }<a name="line.113"></a>
<FONT color="green">114</FONT>          return isRegistered;<a name="line.114"></a>
<FONT color="green">115</FONT>        }<a name="line.115"></a>
<FONT color="green">116</FONT>      }<a name="line.116"></a>
<FONT color="green">117</FONT>    }<a name="line.117"></a>




























































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